chr15-42399500-A-T

Variant names:

• chr15-42399500-A-T
• rs371784007
• NM_000070.3:c.1202A>T
• CAPN3 p.Tyr401Phe

GermlineCancer (beta)

Variant summary

Our verdict is Uncertain significance.

+3 Uncertain · Warm

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 3 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_SupportingO7_SupportingO8_Supporting

The NM_000070.3(CAPN3):c.1202A>T (p.Tyr401Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a cumulative frequency of 0.00000806 (AC=13) in the gnomAD database across 1,613,008 control chromosomes (no homozygotes observed). The grpmax filtering allele frequency (95% CI) is 0.0000158. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic/Likely Pathogenic (★★). A different missense at the same amino acid position has been reported as Pathogenic/Likely Pathogenic in ClinVar: p.Y401C: Conflicting_classifications_of_pathogenicity (ClinVar VariationId 553468) Other variants at the same amino acid position have been reported in ClinVar (not pathogenic): p.Y401H: Uncertain_significance (ClinVar VariationId 3719679, 1 star)

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000082 (0 hom.)
• Consequence: CAPN3 NM_000070.3 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 5.36
• Publications: 2 publications found

Genes affected

CAPN3 (HGNC:1480): (calpain 3) Calpain, a heterodimer consisting of a large and a small subunit, is a major intracellular protease, although its function has not been well established. This gene encodes a muscle-specific member of the calpain large subunit family that specifically binds to titin. Mutations in this gene are associated with limb-girdle muscular dystrophies type 2A. Alternate promoters and alternative splicing result in multiple transcript variants encoding different isoforms and some variants are ubiquitously expressed. [provided by RefSeq, Jul 2008]

CAPN3 Gene-Disease associations (from GenCC):

• muscular dystrophy, limb-girdle, autosomal dominant

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• muscular dystrophy, limb-girdle, autosomal dominant 4

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Natera
• autosomal recessive limb-girdle muscular dystrophy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• autosomal recessive limb-girdle muscular dystrophy type 2A

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Natera, Labcorp Genetics (formerly Invitae), Myriad Women's Health, Orphanet

ENSG00000258461 (HGNC:):

Classification according to ACGS-UK Somatic Oncogenicity v2025

Specifications for CAPN3 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Classification was made for transcript:

Our verdict: Uncertain_significance. The variant received 3 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O3Absent or very rare in population		Very rare in gnomAD (popmax AF <0.01%) — O3 supporting; GnomAD effective popmax AF = 0.000016 — very rare (O3 supporting [+1])
	O7Mutational hotspot or critical domain		Supporting: cancerhotspots.org hit, critical domain, or missense neighbourhood hotspot; No cancerhotspots.org hit at this position; UniProt domain: 0 pathogenic, 0 benign.; ±8 AA neighbourhood: 1 pathogenic, 0 benign (OR vs. background: 15.0); Variant does not impact splicing — splice-hotspot path not applicable
	O8Missense constraint in gene or region		Missense in gene/domain constrained for missense variation where missense is common disease mechanism (O8 supporting); Gene/disease mechanism: missense is a common mechanism of oncogenesis; gnomAD missense Z-score: 0.86 (threshold ≥3.09 for constraint); Domain-level constraint: variant is in a critically constrained functional domain (IS_AT_CRITICAL_DOMAIN)

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_000070.3. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	CAPN3 NM_000070.3	MANE Select	c.1202A>T p.Tyr401Phe	missense	Exon 10 of 24	Prot: NP_000061.1 UniProt:
	CAPN3 NM_024344.2		c.1202A>T p.Tyr401Phe	missense	Exon 10 of 23	Prot: NP_077320.1 UniProt:
	CAPN3 NM_173087.2		c.1058A>T p.Tyr353Phe	missense	Exon 9 of 21	Prot: NP_775110.1 UniProt:

CAPN3 NM_000070.3

MANE Select

HGVSc / HGVSpc.1202A>Tp.Tyr401Phe

Exon rankExon 10 of 24

missense

Prot: NP_000061.1UniProt: P20807-1

CAPN3 NM_024344.2

HGVSc / HGVSpc.1202A>Tp.Tyr401Phe

Exon rankExon 10 of 23

missense

Prot: NP_077320.1UniProt: P20807-3

CAPN3 NM_173087.2

HGVSc / HGVSpc.1058A>Tp.Tyr353Phe

Exon rankExon 9 of 21

missense

Prot: NP_775110.1UniProt: P20807-2

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	CAPN3 ENST00000397163.8	TSL:1MANE Select	c.1202A>T p.Tyr401Phe	missense	Exon 10 of 24	Prot: ENSP00000380349.3 UniProt:
	CAPN3 ENST00000357568.8	TSL:1	c.1202A>T p.Tyr401Phe	missense	Exon 10 of 23	Prot: ENSP00000350181.3 UniProt:
	CAPN3 ENST00000349748.8	TSL:1	c.1058A>T p.Tyr353Phe	missense	Exon 9 of 21	Prot: ENSP00000183936.4 UniProt:

CAPN3 ENST00000397163.8

TSL:1MANE Select

HGVSc / HGVSpc.1202A>Tp.Tyr401Phe

Exon rankExon 10 of 24

missense

Prot: ENSP00000380349.3UniProt: P20807-1

CAPN3 ENST00000357568.8

TSL:1

HGVSc / HGVSpc.1202A>Tp.Tyr401Phe

Exon rankExon 10 of 23

missense

Prot: ENSP00000350181.3UniProt: P20807-3

CAPN3 ENST00000349748.8

TSL:1

HGVSc / HGVSpc.1058A>Tp.Tyr353Phe

Exon rankExon 9 of 21

missense

Prot: ENSP00000183936.4UniProt: P20807-2

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 6 sources Large-scale international reference populations
GnomAD3 genomes	AF: 0.00000658	AC:1	Hom:0	AN:152082	Cov:31
GnomAD2 exomes	AF: 0.00000398	AC:1	Hom:	AN:251462	Cov:
GnomAD4 exome	AF: 0.00000821	AC:12	Hom:0	AN:1460926	Cov:30
GnomAD4 genome	AF: 0.00000658	AC:1	Hom:0	AN:152082	Cov:31
TOPMed (Bravo)	AF: 0.0000151	AC:	Hom:	AN:	Cov:
ALFA (dbGaP/dbSNP Allele Frequency Aggregator)	AF: 0.00	AC:0	Hom:0	AN:33426	Cov:

Showing 6 sources

Case/control cohorts

Cohort	Cases			Controls
	AF	AC	AN	AF	AC	AN
Epi25(Epilepsy)	0.0000477	2	41958	0.00	0	66872
SCHEMA(Schizophrenia)	0.00	0	67868	0.0000150	2	133320

Showing 2 cohortsAllele count / allele number. AF is computed from the counts for ASC (not provided by the source).

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
2	-	-	Autosomal recessive limb-girdle muscular dystrophy type 2A (2)
1	-	-	Autosomal recessive limb-girdle muscular dystrophy type 2A;C4748295:Muscular dystrophy, limb-girdle, autosomal dominant 4 (1)
1	-	-	Muscular dystrophy, limb-girdle, autosomal dominant 4 (1)

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Pathogenic	21
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	0.0076	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	21
DANN	Benign	0.83
DEOGEN2	Benign	0.069	T
Eigen	Benign	-0.40
Eigen_PC	Benign	-0.15
FATHMM_MKL	Uncertain	0.76	D
FuncVEP CTI	Benign	0.033
GPN-Star LLR	N/A	-6.0
GPN-Star score	N/A	6.0
LIST_S2	Uncertain	0.91	D
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.18	T
MetaSVM	Benign	-0.67	T
Mutation Taster	N/A	75/25	polymorphism
MutationAssessor	Benign	-0.28	N
PhyloP100	Uncertain	5.4
popEVE	Benign	-2.6
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	0.94	N
REVEL	Uncertain	0.31
Sift	Benign	1.0	T
Sift4G	Benign	1.0	T
Varity_R	N/A	0.25
VESM-3B	Benign	-5.5

Showing 28 of 28 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.010
SpliceAI score (max)	Benign	0.0	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs371784007;

hg19: chr15-42691698;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar